Earthquake may cause severe damage to all kinds of bridge such as the falling down of the girder; therefore,effective measures should be employed to control the seismic displacement. In this paper,the method of compre...Earthquake may cause severe damage to all kinds of bridge such as the falling down of the girder; therefore,effective measures should be employed to control the seismic displacement. In this paper,the method of comprehensive optimal control,com-bined with analytic hierarchy process,is employed to investigate the seismic response control of the Nanjing Jiangxinzhou Bridge,which is a single-tower self-anchored suspension bridge （SSSB）. Also,3-dimensional nonlinear seismic response analyses are con-ducted. Three types of practical connection measures for seismic response control of SSSB are investigated,and the optimal pa-rameters of the connection devices are achieved by this method. Results show that both the elastic connection devices and the damp-ers with rational parameters can reduce the seismic displacement of the bridge effectively,but the elastic connection devices will in-crease the seismic force of the tower. When all factors are consid-ered,the optimal measure is by using the elastic connection devices and the dampers together. These results can provide references for seismic response control of SSSBs.展开更多
重点介绍了首钢股份有限公司炼铁作业部球团二系列活性炭脱硫脱硝解析塔基本结构,针对解析塔运行中出现二氧化硫浓度低、脱气段温度偏差大等问题进行综合研究分析,对解析塔加热段和冷却段烟气循环工艺流程进行优化、加热段回热风机增容...重点介绍了首钢股份有限公司炼铁作业部球团二系列活性炭脱硫脱硝解析塔基本结构,针对解析塔运行中出现二氧化硫浓度低、脱气段温度偏差大等问题进行综合研究分析,对解析塔加热段和冷却段烟气循环工艺流程进行优化、加热段回热风机增容、解析塔内部列管结构改造,项目实施后脱气段炭温温差缩小到30℃以内,加热炉高炉煤气小时平均用量降低2000 m 3/h,解析的二氧化硫浓度提高2%左右,解析后的活性炭含硫量平均降低0.128%,达到了预期效果。展开更多
In Korea construction industry, the increase of tower crane’s usage continuously and the accidents of tower crane are increasing simultaneously. But research on tower crane is insufficient for reducing the tower cran...In Korea construction industry, the increase of tower crane’s usage continuously and the accidents of tower crane are increasing simultaneously. But research on tower crane is insufficient for reducing the tower crane accident. This study aims to derive the importance ranking of accident factors of cab-control tower crane by AHP analysis. AHP survey was conducted on experts such as construction engineer, construction manager, safety engineer, and tower crane operator, who have more than 10-year career. The results of AHP analysis reveal that top ranking factor of cab-control tower crane’s accident is erection work. Therefore, the derived factors should be managed, and the priority measures taken for reducing the tower crane accidents according to the ranking of accident factors.展开更多
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scientists (50725828)the National Natural Science Foundation of China (50908046)the Specialized Research Fund for the Doctoral Program of Higher Education (200802861012)
文摘Earthquake may cause severe damage to all kinds of bridge such as the falling down of the girder; therefore,effective measures should be employed to control the seismic displacement. In this paper,the method of comprehensive optimal control,com-bined with analytic hierarchy process,is employed to investigate the seismic response control of the Nanjing Jiangxinzhou Bridge,which is a single-tower self-anchored suspension bridge （SSSB）. Also,3-dimensional nonlinear seismic response analyses are con-ducted. Three types of practical connection measures for seismic response control of SSSB are investigated,and the optimal pa-rameters of the connection devices are achieved by this method. Results show that both the elastic connection devices and the damp-ers with rational parameters can reduce the seismic displacement of the bridge effectively,but the elastic connection devices will in-crease the seismic force of the tower. When all factors are consid-ered,the optimal measure is by using the elastic connection devices and the dampers together. These results can provide references for seismic response control of SSSBs.
文摘重点介绍了首钢股份有限公司炼铁作业部球团二系列活性炭脱硫脱硝解析塔基本结构,针对解析塔运行中出现二氧化硫浓度低、脱气段温度偏差大等问题进行综合研究分析,对解析塔加热段和冷却段烟气循环工艺流程进行优化、加热段回热风机增容、解析塔内部列管结构改造,项目实施后脱气段炭温温差缩小到30℃以内,加热炉高炉煤气小时平均用量降低2000 m 3/h,解析的二氧化硫浓度提高2%左右,解析后的活性炭含硫量平均降低0.128%,达到了预期效果。
文摘In Korea construction industry, the increase of tower crane’s usage continuously and the accidents of tower crane are increasing simultaneously. But research on tower crane is insufficient for reducing the tower crane accident. This study aims to derive the importance ranking of accident factors of cab-control tower crane by AHP analysis. AHP survey was conducted on experts such as construction engineer, construction manager, safety engineer, and tower crane operator, who have more than 10-year career. The results of AHP analysis reveal that top ranking factor of cab-control tower crane’s accident is erection work. Therefore, the derived factors should be managed, and the priority measures taken for reducing the tower crane accidents according to the ranking of accident factors.
